<template>
    <div class="todo-footer" v-show="this.todos.length">
        <label>
            <input type="checkbox" v-model="checkedAll"/>
        </label>
        <span>
            <span>已完成{{this.doneTotal}}</span> / 全部{{this.todos.length}}
        </span>
        <button class="btn btn-danger" @click="delAll">清除已完成任务</button>
    </div>
</template>

<script>
export default {
  name:'MyFooter',
  props:['todos'],
  computed:{
    doneTotal(){
      return this.todos.reduce((preVal,currentVal)=> preVal + (currentVal.done ? 1:0),0);
    },
    checkedAll:{
      get(){
        return this.doneTotal===this.todos.length && this.doneTotal>0;
      },
      set(curCkd){
        // this.ccdAll(curCkd)
        this.$emit('ccdAll',curCkd)
      }
    }

  },
  methods: {
    delAll(){
      // this.deltodoAll();
      this.$emit('deltodoAll')
    }
  },
}
</script>

<style scoped>
/*footer*/
  .todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
  }

  .todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
  }

  .todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
  }

  .todo-footer button {
    float: right;
    margin-top: 5px;
  }
</style>